/* =============================================================
   QR3D — hoja de estilos única
   1 Tokens · 2 Reset · 3 Utilidades · 4 Tipografía · 5 Componentes
   6 Herramienta · 7 Secciones · 8 Anuncios · 9 Responsive · 10 Motion
   ============================================================= */

/* 1. Tokens ---------------------------------------------------- */
:root {
  --paper:      #f6f5f1;
  --card:       #ffffff;
  --ink:        #14161f;
  --ink-soft:   #565c6e;
  --ink-faint:  #6b7183;   /* 4.9:1 sobre blanco — mínimo AA para texto pequeño */
  --line:       #e3e0d8;
  --line-soft:  #efece5;
  --accent:     #d9480f;
  --accent-ink: #ffffff;
  --accent-bg:  #fdf0e9;
  --teal:       #0b7285;
  --warn:       #a1560a;
  --warn-bg:    #fdf5e6;
  --danger:     #b42318;
  --danger-bg:  #fdf0ef;
  --ok:         #146c43;
  --ok-bg:      #eef7f1;

  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --display: "Manrope", var(--sans);

  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 18px;
  --shadow-sm: 0 1px 2px rgba(20, 22, 31, .06), 0 1px 3px rgba(20, 22, 31, .04);
  --shadow-md: 0 8px 28px rgba(20, 22, 31, .08);
  --gutter: clamp(1rem, 4vw, 2rem);
  --ease-out: cubic-bezier(.16, 1, .3, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:      #101219;
    --card:       #171a23;
    --ink:        #ecebf0;
    --ink-soft:   #a7adbe;
    --ink-faint:  #868da0;   /* 5.3:1 sobre la tarjeta oscura */
    --line:       #2a2f3c;
    --line-soft:  #222734;
    --accent:     #ff7a45;
    --accent-ink: #1a0d06;
    --accent-bg:  #2a1810;
    --teal:       #4dc4d9;
    --warn:       #e8b463;
    --warn-bg:    #2a2317;
    --danger:     #ff8b81;
    --danger-bg:  #2c1a19;
    --ok:         #6ede9f;
    --ok-bg:      #16261e;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, .45);
  }
}

/* 2. Reset ----------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; tab-size: 2; scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}
img, svg, canvas, video { display: block; max-width: 100%; }
img { height: auto; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
p { text-wrap: pretty; }
h1, h2, h3 { font-family: var(--display); line-height: 1.1; letter-spacing: -.02em; text-wrap: balance; }
::selection { background: var(--accent); color: var(--accent-ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

/* 3. Utilidades ------------------------------------------------ */
.wrap { width: min(1180px, 100%); margin-inline: auto; padding-inline: var(--gutter); }
.is-hidden { display: none !important; }
.skip-link {
  position: fixed; top: -100px; left: 1rem; z-index: 999;
  padding: .6rem 1rem; background: var(--ink); color: var(--paper);
  border-radius: var(--r-sm); font-weight: 600;
}
.skip-link:focus { top: 1rem; }

/* 4. Tipografía ------------------------------------------------ */
h1 { font-size: clamp(1.9rem, 5.2vw, 3rem); font-weight: 800; }
h2 { font-size: clamp(1.4rem, 3.4vw, 2rem); font-weight: 800; }
h3 { font-size: 1.06rem; font-weight: 700; }
.section { padding-block: clamp(2.6rem, 6vw, 4.4rem); }
.section > h2 { margin-bottom: 1.4rem; }

/* 5. Componentes ----------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: .5rem; flex-direction: column;
  padding: .74rem 1.1rem; border-radius: var(--r-md);
  font-weight: 600; text-align: center;
  border: 1px solid transparent;
  transition: background-color .18s var(--ease-out), border-color .18s var(--ease-out), transform .18s var(--ease-out);
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--accent-ink); box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: color-mix(in srgb, var(--accent) 88%, black); }
.btn-second { background: var(--card); border-color: var(--line); color: var(--ink); }
.btn-second:hover { border-color: var(--ink-faint); }
.btn-ghost { border-color: transparent; color: var(--ink-soft); text-decoration: underline; text-underline-offset: 3px; }
.btn-ghost:hover { color: var(--ink); }
.btn-sm { padding: .42rem .7rem; font-size: .86rem; font-weight: 500; }
.btn[disabled] { opacity: .5; pointer-events: none; }
.btn-main { font-size: 1rem; }
.btn-sub { font-size: .78rem; font-weight: 500; opacity: .85; }

.site-header { border-bottom: 1px solid var(--line); background: var(--card); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-block: .8rem; }
.brand { display: inline-flex; align-items: center; gap: .55rem; font-family: var(--display); font-weight: 800; font-size: 1.15rem; letter-spacing: -.03em; }
.brand-mark { width: 26px; height: 26px; fill: var(--accent); }
.header-nav { display: flex; gap: 1.1rem; font-size: .92rem; color: var(--ink-soft); }
.header-nav a:hover { color: var(--ink); }

/* 6. Herramienta ----------------------------------------------- */
.hero { padding-top: clamp(1.6rem, 4vw, 2.6rem); padding-bottom: 1.1rem; }
.hero-sub { max-width: 62ch; margin-top: .7rem; color: var(--ink-soft); font-size: 1.02rem; }
.hero-sub strong { color: var(--ink); }

.tool-card {
  display: grid; gap: clamp(1.1rem, 2.4vw, 2rem);
  /* Un solo recurso de profundidad: el borde define el canto, sin halo difuso. */
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--r-lg); box-shadow: var(--shadow-sm);
  padding: 1rem;
}
.tool-controls { display: flex; flex-direction: column; gap: 1.05rem; min-width: 0; }
.tool-output { display: flex; flex-direction: column; gap: .9rem; min-width: 0; }

.field { display: flex; flex-direction: column; gap: .42rem; }
.field-label { font-size: .82rem; font-weight: 600; letter-spacing: .01em; color: var(--ink-soft); }
.field-note { font-weight: 400; color: var(--ink-faint); }
.hint { font-size: .8rem; color: var(--ink-faint); }
.sep { border: 0; border-top: 1px solid var(--line-soft); margin-block: .2rem; }

input[type="url"], input[type="text"], textarea, select {
  width: 100%; padding: .66rem .8rem;
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--r-sm);
  transition: border-color .18s var(--ease-out);
}
input[type="url"]:focus, input[type="text"]:focus, textarea:focus, select:focus { border-color: var(--accent); outline: none; }
textarea { resize: vertical; }
input[type="range"] { width: 100%; accent-color: var(--accent); }

.seg { display: grid; grid-template-columns: repeat(3, 1fr); gap: .3rem; background: var(--line-soft); padding: .25rem; border-radius: var(--r-md); }
.seg-4 { grid-template-columns: repeat(4, 1fr); }
.seg-3 { grid-template-columns: repeat(3, 1fr); }
.seg-btn {
  padding: .5rem .3rem; border-radius: var(--r-sm);
  font-size: .84rem; font-weight: 600; color: var(--ink-soft);
  transition: background-color .18s var(--ease-out), color .18s var(--ease-out);
}
.seg-btn:hover { color: var(--ink); }
.seg-btn.is-on { background: var(--card); color: var(--ink); box-shadow: var(--shadow-sm); }

.colors { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem; }
.color-pick { display: flex; align-items: center; gap: .55rem; padding: .45rem .6rem; border: 1px solid var(--line); border-radius: var(--r-sm); cursor: pointer; }
.color-pick input[type="color"] { width: 34px; height: 30px; padding: 0; border: 0; border-radius: 6px; background: none; cursor: pointer; }
.color-pick span { font-size: .82rem; color: var(--ink-soft); }

.emoji-row { display: flex; flex-wrap: wrap; gap: .3rem; }
.emoji-btn {
  width: 38px; height: 38px; font-size: 1.15rem; line-height: 1;
  border: 1px solid var(--line); border-radius: var(--r-sm); background: var(--card);
  transition: border-color .18s var(--ease-out), background-color .18s var(--ease-out);
}
.emoji-btn:hover { border-color: var(--ink-faint); }
.emoji-btn.is-on { border-color: var(--accent); background: var(--accent-bg); }
.center-actions { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; }

.preview-2d, .preview-3d { display: flex; flex-direction: column; gap: .4rem; }
.preview-2d figcaption, .preview-3d figcaption {
  font-size: .78rem; font-weight: 600; color: var(--ink-faint);
  text-transform: uppercase; letter-spacing: .06em;
  display: flex; justify-content: space-between; align-items: baseline; gap: .5rem;
}
.viewer-hint { font-size: .78rem; color: var(--ink-faint); }
.qr-holder {
  display: grid; place-items: center; padding: .8rem;
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--r-md);
  min-height: 180px;
}
.qr-holder canvas, .qr-holder svg { width: min(260px, 100%) !important; height: auto !important; border-radius: 4px; }
.viewer {
  position: relative; aspect-ratio: 4 / 3; min-height: 210px;
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--r-md);
  overflow: hidden; display: grid; place-items: center;
  touch-action: none; cursor: grab;
}
.viewer:active { cursor: grabbing; }
.viewer canvas { width: 100% !important; height: 100% !important; }
.viewer-msg { position: absolute; inset: auto; padding: 1rem; font-size: .88rem; color: var(--ink-faint); text-align: center; }

.avisos { display: flex; flex-direction: column; gap: .4rem; }
.aviso {
  display: flex; gap: .5rem; align-items: flex-start;
  padding: .55rem .7rem; border-radius: var(--r-sm);
  font-size: .84rem; line-height: 1.45;
  border: 1px solid transparent;
}
.aviso-ok { background: var(--ok-bg); color: var(--ok); border-color: color-mix(in srgb, var(--ok) 25%, transparent); }
.aviso-warn { background: var(--warn-bg); color: var(--warn); border-color: color-mix(in srgb, var(--warn) 30%, transparent); }
.aviso-bad { background: var(--danger-bg); color: var(--danger); border-color: color-mix(in srgb, var(--danger) 30%, transparent); }

.downloads { display: flex; flex-direction: column; gap: .55rem; }
.btn-3mf { width: 100%; padding-block: .9rem; }
.dl-row { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; }
.dl-row .btn-second { flex: 1 1 auto; }
.privacy { font-size: .8rem; color: var(--ink-faint); }

/* 7. Secciones ------------------------------------------------- */
.pasos { display: grid; gap: 1rem; list-style: none; padding: 0; grid-template-columns: 1fr; counter-reset: none; }
.paso { background: var(--card); border: 1px solid var(--line); border-radius: var(--r-md); padding: 1.1rem; }
.paso-num {
  display: inline-grid; place-items: center; width: 30px; height: 30px; margin-bottom: .55rem;
  border-radius: 50%; background: var(--accent-bg); color: var(--accent);
  font-family: var(--display); font-weight: 800; font-size: .95rem;
}
.paso h3 { margin-bottom: .3rem; }
.paso p { font-size: .92rem; color: var(--ink-soft); }

.prose { max-width: 74ch; }
.prose h2 { margin-bottom: .8rem; font-size: clamp(1.25rem, 2.6vw, 1.5rem); }
.prose p + h2 { margin-top: 2rem; }
.prose h3 { margin-top: 1.6rem; margin-bottom: .4rem; font-size: 1.12rem; }
.prose p { margin-bottom: .85rem; color: var(--ink-soft); }
.prose strong { color: var(--ink); }

.ideas { display: grid; gap: .9rem; grid-template-columns: 1fr; }
.idea { background: var(--card); border: 1px solid var(--line); border-radius: var(--r-md); padding: 1rem 1.1rem; }
.idea-emoji { font-size: 1.4rem; display: block; margin-bottom: .35rem; }
.idea h3 { margin-bottom: .25rem; }
.idea p { font-size: .9rem; color: var(--ink-soft); }

.faq { display: flex; flex-direction: column; gap: .5rem; max-width: 82ch; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: var(--r-md); }
.faq summary {
  cursor: pointer; padding: .85rem 1rem; font-weight: 600; font-size: .96rem;
  list-style: none; display: flex; justify-content: space-between; gap: 1rem; align-items: center;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 1.2rem; color: var(--accent); font-weight: 700; }
.faq details[open] summary::after { content: "−"; }
.faq details p { padding: 0 1rem 1rem; font-size: .92rem; color: var(--ink-soft); }

.site-footer { border-top: 1px solid var(--line); background: var(--card); margin-top: 2rem; }
.footer-inner { display: flex; flex-wrap: wrap; gap: .6rem 1.4rem; justify-content: space-between; align-items: center; padding-block: 1.4rem; font-size: .86rem; color: var(--ink-soft); }
.footer-nav { display: flex; gap: 1rem; }
.footer-nav a { text-decoration: underline; text-underline-offset: 3px; }

/* 8. Huecos de anuncios (placeholders, sin código de terceros) --- */
.ad-slot {
  display: grid; place-items: center; padding: 14px;
  border: 1px dashed var(--line); border-radius: var(--r-md);
  background: color-mix(in srgb, var(--line-soft) 60%, transparent);
  color: var(--ink-faint); font-size: .72rem; letter-spacing: .18em; font-weight: 600;
}
.ad-leaderboard { min-height: 92px; margin-block: .6rem 0; }
.ad-incontent { min-height: 250px; margin-block: 1rem; }
.ad-corner { min-height: 96px; width: 250px; background: var(--card); }
.ad-dialog-slot { min-height: 200px; margin-block: .9rem; }

/* Los elementos flotantes se apoyan en la elevación, no en el borde. */
.ad-toast {
  position: fixed; right: 1rem; bottom: 1rem; z-index: 60;
  background: var(--card); border-radius: var(--r-md);
  box-shadow: var(--shadow-md); padding: .6rem;
}
.ad-toast-close {
  position: absolute; top: -10px; right: -10px; width: 26px; height: 26px;
  border-radius: 50%; background: var(--ink); color: var(--paper);
  font-size: 1rem; line-height: 1; display: grid; place-items: center;
}
.ad-dialog {
  border: 0; border-radius: var(--r-lg); padding: 0;
  background: var(--card); color: var(--ink);
  width: min(420px, calc(100vw - 2rem)); box-shadow: var(--shadow-md);
}
.ad-dialog::backdrop { background: rgba(10, 12, 18, .55); }
.ad-dialog-inner { position: relative; padding: 1.3rem; text-align: center; }
.ad-dialog-close { position: absolute; top: .5rem; right: .7rem; font-size: 1.5rem; line-height: 1; color: var(--ink-faint); }
.ad-dialog-close:hover { color: var(--ink); }
.ad-dialog-title { font-family: var(--display); font-weight: 800; font-size: 1.1rem; }
.ad-dialog-text { font-size: .9rem; color: var(--ink-soft); margin-top: .25rem; }
.ad-dialog .btn-second { width: 100%; }

/* 9. Responsive ------------------------------------------------ */
@media (min-width: 540px) {
  .pasos, .ideas { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .tool-card {
    grid-template-columns: minmax(0, 380px) minmax(0, 1fr);
    grid-template-rows: auto 1fr;   /* la columna derecha abarca 2 filas: sin esto infla la primera */
    align-items: start;
    padding: 1.7rem;
  }
  .tool-contenido { grid-column: 1; grid-row: 1; }
  .tool-controls  { grid-column: 1; grid-row: 2; }
  .tool-output    { grid-column: 2; grid-row: 1 / span 2; }
  .tool-output { position: sticky; top: 1rem; }
  .pasos { grid-template-columns: repeat(3, 1fr); }
  .ideas { grid-template-columns: repeat(3, 1fr); }
  .qr-holder canvas, .qr-holder svg { width: min(300px, 100%) !important; }
}

/* 10. Motion reducida (solo lo intrusivo) ----------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}